This Workshop Manual contains technical information, descriptions, and repair instructions for the standard versions of the drive units 280, 280T, 280PT, 285, 285A, 290, 290A, 280-DP, 280-DP/PT, 290-DP, 290A-DP, SP-A, SP-A1, SP-A2, SP-C, DP-A, DP-A1, DP-A2, DP-B, DP-B1, DP-C and DP-C1. The Workshop Manual can show operations carried out on any of the drives listed above. As a result the illustrations and pictures in the manual that show cer- tain parts on the drives, do not in some cases apply to all the drives listed. However the repair and serv- ice operations described are in all essential details the same.